init: 提交 files 服务初始代码

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/auth/actor.go

@@ -0,0 +1,46 @@
+package auth
+
+import (
+	"git.apinb.com/bsm-sdk/core/middleware"
+	"github.com/gin-gonic/gin"
+)
+
+const (
+	ActorTypeUser    = "user"
+	ActorTypeService = "service"
+
+	actorContextKey = "files.auth.actor"
+)
+
+type Actor struct {
+	Type     string
+	ID       uint
+	Identity string
+}
+
+func FromContext(ctx *gin.Context) (Actor, bool) {
+	if actor, ok := ctx.Get(actorContextKey); ok {
+		serviceActor, ok := actor.(Actor)
+		if ok && serviceActor.Type == ActorTypeService && serviceActor.ID == 0 && serviceActor.Identity != "" {
+			return serviceActor, true
+		}
+	}
+
+	claims, err := middleware.ParseAuth(ctx)
+	if err != nil || claims == nil || claims.ID == 0 || claims.Identity == "" {
+		return Actor{}, false
+	}
+
+	return Actor{
+		Type:     ActorTypeUser,
+		ID:       claims.ID,
+		Identity: claims.Identity,
+	}, true
+}
+
+func withActor(ctx *gin.Context, actor Actor) {
+	if actor.Type != ActorTypeService || actor.ID != 0 || actor.Identity == "" {
+		return
+	}
+	ctx.Set(actorContextKey, actor)
+}